TBI to port fuel (pics)
07-29-2015, 09:00 PM
#2
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: TBI to port fuel (pics)
I didn't know you had a c4. Was it crossfire originally?
-- Joe
-- Joe
07-30-2015, 11:50 AM
#3
Re: TBI to port fuel (pics)
yes. Crossfire to XRam to Holley projection with 7.4L TB with 75 lbs injs @21 lbs FP. Now port fuel. Car runs so much better. That 2.0 inch bonnet had the inj pods blocking air flow I believe at 5800-6000. Not much room under bonnet. Plus the fuel control may have been compromised being TBI. Port fuel solved a few issues with drivability. EBL Flash is ECU. Prior hardware 4 sale in classifieds.
08-03-2015, 01:56 PM
#6
Re: TBI to port fuel (pics)
How does it idle wit the 224 cam? How much manifold vac? I know it would have a bit of a lope in a 350...
I get about 14-15 inHg with my 212 cam in my 350, and it idles pretty dang smooth, so that'd be my reference point.
Also, how much are you putting down with it?
I get about 14-15 inHg with my 212 cam in my 350, and it idles pretty dang smooth, so that'd be my reference point.
Also, how much are you putting down with it?
08-03-2015, 04:31 PM
#7
Re: TBI to port fuel (pics)
Idle was Ok with the TBI BUT that was OL with VE cells flat around the map/rpm it idled at. That was 775-800(wander) with a manual trans. Idle spark locked at 20.
Now I am CL idle at 825 with a stock LT4 tune. Does not wander and cells are not flattened. Sa locked 20. I only put 25 miles on car since the induction changed. So the cam is not too radical. 114 LSA helps but I should have used a 112. When the cubes get upped next year or two I will use a 112 LSA with more duration.
I think the fuel distribution is 10X better with port fuel vs TBI.
I am idling at 48 MAP. With prior manifold I was at 44. I lost vac. Might be the larger intake 1000cfm TB vs 600 on prior.
Now I am CL idle at 825 with a stock LT4 tune. Does not wander and cells are not flattened. Sa locked 20. I only put 25 miles on car since the induction changed. So the cam is not too radical. 114 LSA helps but I should have used a 112. When the cubes get upped next year or two I will use a 112 LSA with more duration.
I think the fuel distribution is 10X better with port fuel vs TBI.
I am idling at 48 MAP. With prior manifold I was at 44. I lost vac. Might be the larger intake 1000cfm TB vs 600 on prior.
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